Does life have a meaning, and if so what is it? What can I be certain of, and how should I act when I am not certain? Why are the established truths of my tribe better than the primitive superstitions of your tribe? Why should I do as I'm told? Those are questions it is easy to avoid, in the rush to acquire goods and prestige. Even for many of a more serious outlook, they are questions easy to dismiss with excuses like "it's all a matter of opinion" or "let's get on with practical matters" or "they're too hard". They are questions that may be ignored, but they do not go away.